Boiler improver and fuel economizer



- Sept. 7 1926; 1,599,063

H. C. PAWSON BOilLER IMPROVER AND FUEL ECONOMIZER Filed August 4, 1925mvan'rn Patented Sept. 7,' 1926.

UNITED TA E55 HERBERT c. r wsoN, or ronon'ro, ONTARIO, CANADA, ASSIGNOBor ONE-HALF 'ro ELrAs E. sL GHr AND SAMUEL L. seumn. BOTH or ronomro,CANADA.

- without disturbing the economize'r. and by PATENT OFFICE.

i roILERIMPRovnR Ann rum. EooNoMIzER.

' A pp licatioufi led August 4, 1925. Serial No. 48,136.

This invention relates to boiler improvers and fuel 'eco'nomizers forheating air and admitting it to the interior of a boiler or furnaceforfacilitating combustion within the furnace combustion chamber.Heretoforefthese devices have been mounted interis objectionableas mostof these devices require to be. set in operation by a skillful operator.Another objectionable feature l resulting from the above arrangement 1sthat the heated air must'ypassthrough. the

products of combustionlin the pipe to get to the "combustion "chamber.My object fisv to provide a simple device? of the above character' whichwill overcome the] above objectionable features and-which may be cheaplymanufactured and readily mounted in position on the furnace.

I attain myobjects by forming my boiler improver andff'ue'l economizeras an eXtension of'the pipe collar" of the furnace where by the furnace"pipe may be taken down extending the; inner end of the economiz er intothe furnace andproviding with a laterally 'directedopening for directingthe 30 air around'the interior of the furnacecoiu. 'bustion chamberandout of the path of the. products of combustion passing through thecollar. ,Thel constructions are hereinafter more fully described andillustrated in the accompanying drawings which: Fig. 1"is' asection'ofpart or. the upper endof a furnace showing my device'in posi-'tiori thereon; and

Fig. 2 is a side elevation. of my device showing the damper partlyopened.

In the drawings like numerals of reference indicate corresponding partsin the different figures.

r 1 .is the upper end of the combustion chamber of the furnace which isprovided with the usual pipe collar 2. The fuel economizer comprises anannular one piece chamber 3, a damper Land an air inlet pipe v5. Theinner end 3 of the outer wall of the chamber is adapted to be receivedin the collar 2 and the outer end 3' of this wall -is substantially thesame diameter as the outside diameter of the collar. This per-- mits thesame flue pipe 6-w hich originally fitted on the collar to be fitted onthe'chamber. The device is secured to the collar by means of set screws7 threaded in a ring 3 which is formed integral with and spaced from theend 3 v to form an annular groove for receiving the collar 2. Air isadmitted to the outer end of the chamberby a pipe 8.

The inner end of .the chamber extends below the inner end of the collar,and a laterally directed opening 3?; or openings, is formed in its outerwall communicating with the interior of the combustion chamber close toits wall; Above its: lower end a partition "3 is formed "in which areformed The number andsize the air openings 3 g of theseopenmgsdeterminesthe flow of air ,to the openings 3. g 7 By arrangingthe latter to direct thecair laterally into the combustion chamber, the

air is directly broughtinto the combustion chamber -without bein ginterfered with by thefiowof products of combustion passing through thecentral opening of the chamber 3 and the flue pipe i6. Its passage bygravity "of the combustion chamberjof thefurnace is by this arrangementmuch facilitated.

, This also tends to prevent the air outlet opening 8? from beingclogged by soot. The

end of tli e pipe ,8 communicating with the,

atmosphere is positioned below the outlet opening 3 to. tend to preventflue gases ,being forced out through the device when 1 a damper 9 isclosed.

The damper is slightly [less] in diameter than the diameter of thecentral passage of 'the" chamber so that the latter is not entirelyclosed off whenthe damper is in its the chamber and passes over theserrations on the lever when the latter is rocked to open thedamper.Immediately the lever is released the arm en ages a tooth to hold thedamper as adjusted. v The. free endof the lever is passed out through aslot 13 in the flue pipe 6 and is provided with a suitable hand grip.

The above arrangement of pivoting the damper permits it, if closed, tobe blown open if a gas explosion occurs in the furnace and if the damperis partly open, when an explosion occurs, the above described releasablelocking means will permit the damper to be blown fully open. Danger ofgas escaping into the building is thus prevented.

In practice the size and number of the openings 3 in the partition 3}are determined by the grate area of the boiler on which the device is tobe installed. Having settled the total area desirable, the workmandrills upthrough the bottom of the annular chamber and through thepartition, afterwards plugging the holes in the bottom.

I find with my device that the eliiciency of the heating system is muchincreased relative to the amount of fuel burned, so much so that in somecases where the efficiency of the system has not been up to the requiredrating, by the use of my device it is possible to so increase theefiiciency as to render the installation of a larger boiler unnecessary.The heat is held more steady and uniform, better combustion of the fuelis obtained leaving only a fine ash, and greater time may be takenbetween firing periods.

The device, it will be noted, is very compact and simple to manufactureand install.

lVhat I claim is i 1. A boiler improver and fuel economizer including anannular chamber having integral inner and Outer walls; a ring formedintegral with and spaced from the outer wall to form an annular grooveadapted to receive a pipe collar of a furnace;rthe outer end of theouter wallbeing substantially the same diameter as the diameter of thesaid collar, the inner end of the chamber being adapted to extend belowthe inner end of the collar and having a laterally directed openingformed therein; an inlet pipe communicating with the end of thecha mberremote from the opening; and a partition formed integral with the innerand outer Walls of the chamber above the opening, the

partition being provided with openings adapted to regulate the flow ofair to the laterally directed opening.

2. A boiler improver and fuel economizer including an annular chamberhaving one end of its outer wall adapted to be received in a pipe collarof a furnace and to extend below the collar into the interior ofthefurnace, the other end being adapted to receive {a line pipe, an airopening being formed at the upper end of the chamber and a laterallydirected opening at the lower end of the chamber, through which the airfrom the chamber may pass close to the in side of the casing of thefurnace; and a perforated partition dividing the annular chamber aboveits lower end and serving to regulate the flow of air to the outlet.

3. The combination with a furnace having a pipe collar, of an annularchamber carried within the said collar and provided with air inlet andoutletopenings and a central passage for flue gases; a fine pipeconnected with the chamber; a damper for controlling the passage of theproducts of combustion through the central passage, the damper beingpivotally mounted so that a gas er."- plosion will blow it to the openposition; and means for releasably locking the damper in an openposition, the said 'means being adapted to permit a gas explosion toblow the damper wide open and to retain it in the position to which itis blown until manually reset.

4. The combination with a furnace, of means associated with the smokecollar of the furnace for supplying fresh air to the interior of thefurnace and having a passage for line gases and a damper for controllingthe passage of the flue gases through the passage, the damper beingpivotally mounted so that a gas explosion will blow it to the openposition; and means for releasably locking the damper in an openposition, the said means being adapted to permit a gas e:;- plosion toblow the damper wide open and to retain it in the position to which itis blown until manually reset.

Signed at Toronto, Can., this 25th day of July, 1925.

HERBERT C. PAlV SON.

